Dephasing in Fluxonium Qubits from Coherent Quantum Phase Slips

ORAL

Abstract

Recent experiments on fluxonium qubits in planar circuit architectures have demonstrated near-record coherence times and gate fidelities. In order to improve these metrics further, we seek to develop a holistic model of decoherence in fluxonium qubits. Here we focus on one dephasing mechanism inherent to Josephson junction arrays which arises from the Aharonov-Casher effect and can limit fluxonium coherence times in circuits with large superinductors. In this talk, we report coherence times in fluxonium qubits specifically engineered to be sensitive to this dephasing mechanism and compare with theoretical models.

*This material is based upon work supported by the Under Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U.S. Air Force or of the Under Secretary of Defense for Research and Engineering.

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Presenters

  • Kyle Serniak

    • MIT Lincoln Laboratory

Authors

  • Kyle Serniak

    • MIT Lincoln Laboratory

  • Thomas M Hazard

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Agustin Di Paolo

    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology

  • Kate Azar

    • MIT Lincoln Laboratory

  • Leon Ding

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Max Hays

    • Massachusetts Institute of Technology (MIT)
    • MIT
    • Massachusetts Institute of Technology

  • Junyoung An

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Ilan T Rosen

    • Stanford Univ
    • Massachusetts Institute of Technology

  • David K Kim

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Alexander Melville

    • MIT Lincoln Laboratory

  • Bethany M Niedzielski

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Jeffrey A Grover

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology

  • Mollie E Schwartz

    • MIT Lincoln Laboratory

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • William D Oliver

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology (MIT), MIT Lincoln Laboratory
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology, MIT Lincoln Laboratory